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mixer [17]
3 years ago
14

Braden is hiking on a mountain. At 11:00 a.M., he is at an elevation of 500 feet. At 2:00 p.M., he is at 900 feet. What is the r

ate of change in elevation?
Mathematics
1 answer:
kramer3 years ago
3 0

Answer:

133.33ft/hr

Step-by-step explanation:

Between 11am and 2pm, he had 3hrs

Height change 900 - 500 = 400ft

400/3 = 133.33ft/hr

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Weight gain during pregnancy. In 2004, the state of North Carolina released to the public a large data set containing informatio
pychu [463]

Answer:

1. B. H0: μ1−μ2=0, HA: μ1−μ2≠0

2. z=1.2114

3. P-value=0.2257

4. Do not reject H0

Step-by-step explanation:

We have to perfomr an hypothesis test to see if there is strong evidence that there is a significant difference between the two population means.

The null and alternative hypothesis are:

H_0: \mu_1-\mu_2=0\\\\H_a: \mu_1-\mu_2\neq0

Being μ1 the mean average gain for younger mothers and μ2 the mean average gain for mature mothers.

(NOTE: we are comparing means, not proportions, as it is the random variable is the weight gain).

As we are claiming "strong evidence", the level of significance will be 0.01.

For younger mothers, the sample size is n1=840, the sample mean is 30.7 and  the sample standard deviation is s1=14.91.

For mature mothers, the sample size is n2=132, the sample mean is 29.15 and the sample standard deviation is s2=13.46.

The difference between means is

M_d=\mu_1-\mu_2=30.7-29.15=1.55

The standard error of the difference between means is

s_M=\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}=\sqrt{\dfrac{14.91^2}{840}+\dfrac{13.46^2}{132}}=\sqrt{ 0.2647+1.3725}=\sqrt{1.6372}\\\\\\s_M=1.2795

Then, the statistic can be calculated as:

z=\dfrac{M_d-(\mu_1-\mu_2)}{s_M}=\dfrac{1.55-0}{1.2795}=1.2114

The P-value for this z-statistic in a two tailed test is:

P-value=2P(z>1.2114)=0.2257

As the P-value is greater than the significance level, the null hypothesis failed to be rejected.

There is no enough evidence to claim that the real average weight gain differs from mature and youger mothers.

5 0
3 years ago
Which phrase accurately describes a distribution that's bell-shaped but not symmetric?
Evgen [1.6K]
What is symetertic to help
7 0
3 years ago
Help me please I need the answer
Lisa [10]

Answer:

I not sure but I think it's A

Step-by-step explanation:

Daniel had 5 rose bushes and and 6 pots of moss which equaled 132. Hannah spent 228 on 10 rose bushes and 9 pots, A basically explains that.

6 0
3 years ago
Where does -5 5/6 go between -5 and -6 on a number line
Murljashka [212]
3157 tshjb. Josh. Job n McJob
4 0
3 years ago
What is bigger 6 kg or 600 g
Alexeev081 [22]

Answer:

6kg

Step-by-step explanation:

kg are bigger than g

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2 years ago
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